Bugzilla

On certain very common architectures (e.g. Intel) we may be able to avoid texture uploads/copies from SHM for SW-WR:

> (21:06:05) robert_mader: emersion, daniels: talking about shm buffer handling, has one of you looked into https://software.intel.com/content/www/us/en/develop/articles/zero-copy-texture-uploads-in-chrome-os.html before? Looks like on intel and similar we could avoid texture uploads from shm altogether
> (21:08:11) daniels: robert_mader: we can't really avoid uploads from shm, because you need to alloc a BO from vgem - it doesn't give you a way to wrap vaddr+len into a BO
> (21:08:28) daniels: so clients can do that today if they alloc using vgem and send via dmabuf
> (21:09:04) robert_mader: oh cool - so all compositors support this in theory?
> (21:16:02) jadahl: daniels: sounds like something gtk3 could benefit from
> (21:16:15) jadahl: as it'll likely never see any hw acceleration
> (21:17:52) daniels: robert_mader: yeah, as long as your driver can import from vgem, which is ... not all of them
> (21:17:55) daniels: jadahl: EFL does this too

On certain very common architectures (e.g. Intel) we may be able to avoid texture uploads/copies from SHM for SW-WR:

> (21:06:05) robert_mader: emersion, daniels: talking about shm buffer handling, has one of you looked into https://software.intel.com/content/www/us/en/develop/articles/zero-copy-texture-uploads-in-chrome-os.html before? Looks like on intel and similar we could avoid texture uploads from shm altogether
> (21:08:11) daniels: robert_mader: we can't really avoid uploads from shm, because you need to alloc a BO from vgem - it doesn't give you a way to wrap vaddr+len into a BO
> (21:08:28) daniels: so clients can do that today if they alloc using vgem and send via dmabuf
> (21:09:04) robert_mader: oh cool - so all compositors support this in theory?
> (21:16:02) jadahl: daniels: sounds like something gtk3 could benefit from
> (21:16:15) jadahl: as it'll likely never see any hw acceleration
> (21:17:52) daniels: robert_mader: yeah, as long as your driver can import from vgem, which is ... not all of them
> (21:17:55) daniels: jadahl: EFL does this too
> (21:39:13) emersion: i don't see vgem loaded often
> (21:40:51) daniels: a lot of people don't ship it because it will generally claim card0 and annoy dumb userspace
> (21:41:27) daniels: also it's an unguarded interface which allows userspace to allocate memory outwith ulimit
> (21:43:42) emersion: allocations not counted towards the allocating process?
> (21:44:59) daniels: right, they don't accrue towards your memory limit
> (21:45:13) daniels: (insert opinion about practical usefulness of ulimit here)